Putanja

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;

double rastojanje(int x, int y)
{
       return sqrt(x*x+y*y);
}

main()
{
      int n, x[30], y[30], a = 0, b = 0;
      double min = 100000;

      cin >> n;

      for(int i=0; i<n; i++)
      {
              cin >> x[i] >> y[i];
              a = a + x[i];
              b = b + y[i];
      }

      cout << a << " " << b << endl;

      a = 0; b = 0;
      for (int j=0; j<n; j++)
      {
          for (int i=0; i<n; i++)
              if (i!=j)
              {
                 a = a + x[i];
                 b = b + y[i];
              }

          if (rastojanje(a, b) < min)
             min = rastojanje(a, b);

          a = 0; b = 0;
      }

      cout << setprecision(2) << fixed << min << endl;


      system("PAUSE");
}